48198domain: NAppears in sequencesa(n) = Sum_{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; initial terms are 1,1,3.at n=18A049866Smallest integers at which the value of truncated Mertens function equals n!.at n=6A093774a(n) = 2*Fibonacci(n) + 8*Fibonacci(n-5).at n=17A101156